Authors:

As holy zeal is the fervency of our grace, so sinful zeal is the intention and fervency of sin.

Richard Baxter (1847). “The Practical Works of Richard Baxter; with a Preface, Giving Some Account of the Author, and of this Edition of His Practical Works; an Essay on His Genius, Works, and Times ...”, p.383
As holy zeal is the fervency of our grace, so sinful zeal is the intention and fervency of sin.